Apex domains cannot have CNAME records.
Question and response
Question
dig it7.com.ua. NS
Answer
it7.com.ua. 5 NS nsa1.srv53.org.
it7.com.ua. 5 NS nsb4.srv53.net.
it7.com.ua. 5 NS nsb3.srv53.org.
it7.com.ua. 5 NS nsb1.srv53.com.
it7.com.ua. 5 NS nsa4.srv53.net.
it7.com.ua. 5 NS nsa4.srv53.com.
it7.com.ua. 5 NS nsc1.srv53.com.
it7.com.ua. 5 NS nsd1.srv53.com.
it7.com.ua. 5 NS nsc2.srv53.net.
it7.com.ua. 5 NS nsc1.srv53.org.
it7.com.ua. 5 NS nsd2.srv53.org.
it7.com.ua. 5 NS nsd3.srv53.net.
Authority
The response has no authority records.
Additional
nsa1.srv53.org. 2 A 178.32.247.3
nsa4.srv53.com. 2 A 178.32.247.10
nsa4.srv53.net. 2 A 178.32.247.2
nsb1.srv53.com. 2 A 135.181.9.147
nsb3.srv53.org. 2 A 135.181.9.155
nsb4.srv53.net. 2 A 135.181.9.157
nsc1.srv53.com. 2 A 78.27.225.73
nsc1.srv53.org. 2 A 78.27.225.71
nsc2.srv53.net. 2 A 78.27.225.69
nsd1.srv53.com. 2 A 89.184.64.99
nsd2.srv53.org. 2 A 89.184.64.95
nsd3.srv53.net. 2 A 89.184.64.81
nsa1.srv53.org. 2 AAAA 2001:41d0:203:dee4:178:32:247:3
nsa4.srv53.com. 2 AAAA 2001:41d0:203:dee4:178:32:247:10
nsa4.srv53.net. 2 AAAA 2001:41d0:203:dee4:178:32:247:2
nsb1.srv53.com. 2 AAAA 2a01:4f9:4a:530c:181:9:147:2
nsb3.srv53.org. 2 AAAA 2a01:4f9:4a:530c:181:9:155:2
nsb4.srv53.net. 2 AAAA 2a01:4f9:4a:530c:181:9:157:2
nsc1.srv53.com. 2 AAAA 2a02:2279:0:1201:78:27:225:73
nsc1.srv53.org. 2 AAAA 2a02:2279:0:1201:78:27:225:71
nsc2.srv53.net. 2 AAAA 2a02:2279:0:1201:78:27:225:69
nsd1.srv53.com. 2 AAAA 2a02:2278:70eb:298:89:184:64:99
nsd2.srv53.org. 2 AAAA 2a02:2278:70eb:298:89:184:64:95
nsd3.srv53.net. 2 AAAA 2a02:2278:70eb:298:89:184:64:81
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0